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Q:

Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of

A) Calcium Carbonate B) Barium Carbonate
C) Calcium Hydrogen Carbonate D) Calcium Oxide
 
Answer & Explanation Answer: A) Calcium Carbonate

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Q:

Which of the following elements has the lowest melting point?

A) Zinc B) Titanium
C) Sulphur D) Fluorine
 
Answer & Explanation Answer: D) Fluorine

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Q:

Potassium Permanganate is used for purifying drinking water, because________

A) It is a reducing agent B) It is an oxidising agent
C) It is a sterilising agent D) It dissolves the impurities of water
 
Answer & Explanation Answer: B) It is an oxidising agent

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Q:

Isotones have always ______

A) Same number of protons B) Same atomic number
C) Same number of neutron D) Same number of proton and same numbe of neutron
 
Answer & Explanation Answer: C) Same number of neutron

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Q:

Which one of the following forms of phosphorus is most reactive?

A) Black phosphorus B) White phosphorus
C) Violet phosphorus D) Red phosphorus
 
Answer & Explanation Answer: B) White phosphorus

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Q:

Which one of the following is an insulator?

A) copper B) wood
C) mercury D) aluminium
 
Answer & Explanation Answer: B) wood

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Q:

Which among the following is white phosphorus?

A) P1 B) P6
C) P4 D) P5
 
Answer & Explanation Answer: C) P4

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Q:

Which of the following elements has the lowest melting point?

A) Oxygen B) Gold
C) Silver D) Manganese
 
Answer & Explanation Answer: A) Oxygen

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